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The internal energy change in a system that has absorbed 2 kcals of heat and done 500J of work is:
Options
(a) 6400 J
(b) 5400 J
(c) 7900 J
(d) 8900 J
Correct Answer:
7900 J
Explanation:
According to first law of thermodynamics Q = ∆U + W
∆U = Q – W = 2 x 4.2 x 1000 – 500 = 8400 – 500 = 7900 J
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Topics: Thermodynamics
(179)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- In the elastic collision of objects
- A projectile is fired at 30°. Neglecting friction, the change in kinetic energy when
- The ratio of the weight of a man in a stationary lift and when it is moving downwards
- The frequency of a light wave in a material is 2 x 10¹⁴ Hz and wavelength is 5000Å.
- If 75% of the radioactive reaction is completed in 2 hrs, what would be
Topics: Thermodynamics (179)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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